大学MOOC 泵与风机(东北大学)1461789169 最新慕课完整章节测试答案
Unit 1 介绍 Introduction
文章目录
- Unit 1 介绍 Introduction
- Unit 10 预旋 Prewhirl
- Unit 11 运行工况点 Operating point
- Unit 13 联合运行 Combined operating
- Unit 14 泵与风机的性能曲线 Performance curve of pump and fan
- Unit 15 相似定律 Similarty law
- Unit 16 气蚀 Cavitation
- Unit 17 叶片的切割与加长 Cutting and lengthening of blade
- Unit 2 分类和基本性能参数 Classification and basic performance parameters
- Unit 4 能量方程 Energy equation
- Unit 5 流体运动和速度三角形 Fluid motion and velocity triangle
- Unit 6 离心式叶轮型式分析 Analysis of types of centrifugal impeller
- Unit 7 轴向力 Axial force
- Unit 8 损失和效率 Loss and efficiency
- Unit 9 性能曲线 Performance curve
介绍 Introduction
1、判断题：
Working medium in pump is liquid, but in fan is gas.
选项：
A: 正确
B: 错误
答案: 【 正确】
Unit 10 预旋 Prewhirl
预旋 Prewhirl
1、填空题：
The prewhirl is composed of and .
答案: 【 Mandatory prewhirl, Free prewhirl】
Unit 11 运行工况点 Operating point
运行工况点 Operating point
1、多选题：
Which is correct about operating point?
选项：
A: It represents the relationship of head of pipe sysyem and lfow rate
B: It is the intersection point of performce curve of pump/fan and pipe ststem.
C: It reflects the balance relationship between energy supply and demand.
D: it only has the stability condition.
答案: 【 It represents the relationship of head of pipe sysyem and lfow rate;
It is the intersection point of performce curve of pump/fan and pipe ststem.;
It reflects the balance relationship between energy supply and demand.】
Unit 13 联合运行 Combined operating
并联运行 parallel operation
1、多选题：
Which is correct about parallel operation?
选项：
A: The fluid is transferred from two pumps into the same pipe sysyem.
B: It is better if the number of pump becomes more.
C: The total flow rate is the sum of each pump.
D: It will no be used as the backup device.
答案: 【 The fluid is transferred from two pumps into the same pipe sysyem.;
The total flow rate is the sum of each pump.】
Unit 14 泵与风机的性能曲线 Performance curve of pump and fan
无因次性能曲线 Non-dimensional performance curve
1、判断题：
The non-dimensional performance curve should be drawn without unit.
选项：
A: 正确
B: 错误
答案: 【 正确】
通用曲线 Common performance curve
1、单选题：
Which one is not correct about common performance curve of pump and fan
选项：
A: only one pump or fan
B: differenct rotating speed
C: drawing on a series of maps
D: based on similartiy law.
答案: 【 drawing on a series of maps】
Unit 15 相似定律 Similarty law
比转速 Specific speed
1、判断题：
The specific speed does not have the only value.
选项：
A: 正确
B: 错误
答案: 【 错误】
2、判断题：
The specific speed is different from rotating speed.
选项：
A: 正确
B: 错误
答案: 【 正确】
3、判断题：
It is the condition of similarity and not the consequent result of similarity.
选项：
A: 正确
B: 错误
答案: 【 错误】
比转速的应用 Application of specific speed
1、判断题：
The pump and fan can be sorted by specific speed.
选项：
A: 正确
B: 错误
答案: 【&nb